System and method for determining rate of rotation using brushle

Details System and method for determining rate of rotation using brushle System and method for determining rate of rotation using brushle

1998-07-27

2000-11-07

Strecker, Gerard

Electricity: measuring and testing

Electrical speed measuring

Including motor current or voltage sensor

310 68B, 318799, 318805, 324161, G01P 346, H02K 1100

Patent

active

061441988

ABSTRACT:
A system and method are provided for measuring rate of rotation. A brushless DC motor is rotated and produces a back electromagnetic force (emf) on each winding thereof. Each winding's back-emf is squared. The squared outputs associated with each winding are combined, with the square root being taken of such combination, to produce a DC output proportional only to the rate of rotation of the motor's shaft.

REFERENCES:
patent: 4275343 (1981-06-01), Fulton et al.
patent: 4520300 (1985-05-01), Fradella
patent: 4705969 (1987-11-01), Gross
patent: 4868497 (1989-09-01), Wallrafen
patent: 5321342 (1994-06-01), Kruse
patent: 5352962 (1994-10-01), Galburt
patent: 5394102 (1995-02-01), Mori et al.
patent: 6018225 (2000-01-01), Garces

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